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I'm modeling a simple hard surface object, not using SDS. But I need a couple of edges to be well rounded, so I beveled them with 3 segments and smooth-shaded the bevel faces. It rounds well enough, except that it doesn't blend with the other faces, there is a hard seam between the smooth-shaded and flat-shaded faces. Is there a way to fix this? To blend the two together? I need the rest of the faces flat-shaded. So I need to combine the two.

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  • $\begingroup$ You can try to smooth all the mesh but and then the edges you want sharp, make them mark sharp or increase the crease. $\endgroup$ – Igor Tatarnikov Aug 8 '15 at 11:54
  • $\begingroup$ Could you show your mesh with some screenshots ? The mesh should be shaded in smooth I think, whereas your bevel should be smoothed with additional loop cuts. To make "flat" faces to look good after that you may either add Edge Split modifier on the mesh or in Data tab > Normals check Auto Smooth $\endgroup$ – Mr Zak Aug 8 '15 at 12:08
  • $\begingroup$ It works! Edge-Split did it perfectly. $\endgroup$ – Aardo Aug 8 '15 at 12:13
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In many cases it's better not to use different shading types, rather than set whole mesh as smooth.

For the rest of the mesh which is intended to be flat you either add Edge Split modifier or check Auto Smooth in Data tab > Normals and set the andgle you need. Then parts of the mesh will be smooth, others - flat:

enter image description here

When joining several meshes with different split angles used

In this case it may be easier to use Edge Split modifier and apply it. It will create double vertices that will make shading look depending on angle you've selected and after joining meshes even with different angle of splitting normals they all will continue look like they did before.

In other cases

You may want to use Auto Smooth as there will be no extra modifier in stack and no double vertices so the mesh will be easy to edit.

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